Hello to allI would like to know how can I lighten a car alternator load.I am trying to charge 3 car battery of 12 volt 45 amps with an alternator of 12 volt 45 amp in my garage.The alternator run with a small petrol motor but it became "heavy" if I connect more battery to it.I know there is a cheap way to make it lighter but I don't remember where I have read it.Thank you very much

The load on the alternator will depend on the state of the batteries (their discharge state).

You problem(s) start with connecting multiple batteries in parallel - the one with the largest discharge state will dictate how long the system 'tries' to charge the other batteries and, as a result, will OVERCHARGE the others.

If you connect multiple batteries you MUST separate them using diodes (a blocking diode). Google 'split charge diode' and get one suitably rated.

_________________sent from my laptop using my fingers - because we REALLY need to know where it's come from.....

Depends on alternator, but you need to reduce field current so remove a wire going to brushes and fit a bulb holder between wire and brushes then try will different size bulbs until you find one which reduced max charge by required amount.

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